Step 3: Add a Pivot Point to the Casters
Drill out the allthread coupler nuts to 1/4″ so a 1/4″ bolt will pass through them and they will spin freely. Install them in the carrier body and make sure they don't bind against anything. Once that is done, see if your caster mount plates can reach the coupler nuts. Mine were too wide and had to be cut to make a clearance.
Once you have the fit right, weld the coupler nuts to the caster mount plates and install them in the carrier body. Hold the carrier body against a mock-up equipment leg and see if you have enough play. I was shooting for 1/2″ and I got it.
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Seems like a cool DIY project, but I think my definition of simple differs then this guy’s definition. The kit he talks about is about $80 for a 4 pack.